【单选题】异常毒性检查除另有规定外,取符合要求小鼠5只,按《中国药典》(2015年版)该药品项下规定的给药途径,每只小鼠分别给予供试品溶液( )ml
【简答题】探索发现: (1)计算下列各式: ①(x-1)(x+1); ②(x-1)(x 2 +x+1); ③(x-1)(x 3 +x 2 +x+1). (2)观察你所得到的结果,你发现了什么规律?并根据你的结论填空: (x-1)(x n +x n-1 +x n-2 +…+x+1)=______(n为).
【简答题】观察下列各式: ; ; ; … (1)探索其运算规律,并用n(n为)的代数式表示为 _________ ; (2)试运用你发现的规律计算:
【单选题】Questions 5 to 7 will be based on the following news item. How many more users does Facebook have compared with the population of China?
【单选题】How many more users does Facebook have compared with the population of China?
【简答题】Does China have more English learners than the whole population of the US?
【简答题】观察下列各式:﹣1× =﹣1+ ﹣ × =﹣ + ﹣ × =﹣ + … (1)你能探索出什么规律?(用文字或表达式) (2)试运用你发现的规律计算:(﹣1× )+(﹣ × )+(﹣ × )+…+(﹣ × )+(﹣ × )